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Waves and the particle nature of light
Quick questions on Photoelectric effect and quantum: photons, work function and energy levels - Edexcel A-Level Physics
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the photon model?Show answer
The photon model says light energy is delivered in indivisible lumps, not continuously as the wave model assumes. The intensity of a beam sets how many photons arrive per second; the frequency sets the energy of each one.
What is q1?Show answer
State what is meant by the work function of a metal. [1 mark]
What is q2?Show answer
Find the energy of a photon of frequency Hz. Take J s. [2 marks]
What is q3?Show answer
Explain why no electrons are emitted below the threshold frequency, however bright the light. [2 marks]
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